Test students' ability to apply life cycle assessment (LCA) and basic economic evaluation to compare environmental and cost impacts of single‑use versus reusable packaging. Scope: define functional unit and system boundaries; select relevant life‑cycle stages and impact categories; perform simple per‑use LCA calculations (material production, transport, use, end‑of‑life) and cost analyses (unit cost, reuse rate, break‑even, sensitivity); interpret trade‑offs and justify recommendations under stated assumptions.